CAN'T DEFLECT A SURFACE

[Lorenzo Naddei]

Hi, I have a problem with my V-tail model analysis on VSPAERO.
When I select a "rudder" deflection on VSPAERO the control surface moves but when I select a "elevator" deflection the control surface doesn't move!
I checked the grouping and it seems correct, can somebody help me solve this problem?

Thank you

Lorenzo

[Rob McDonald]

Looks like a bug.

If I delete your rudder control grouping, the elevator grouping works.  I'll see if I can work it out, but hopefully you can work around it for now.

Rob

[Lorenzo Naddei]

Thank you for the response, how can I work around it? Should I add a second control surface to move the elevator or is there something I can do on the settings?

Lorenzo

[Rob McDonald]

Just save two files -- one with the elevator, the other with the rudder.  Run things twice, figure it out.

Rob

[Brandon Litherland]

Following up on this:

You have the same set of component control surfaces (CODA > ElevonI) assigned to two different, yet active, control groups.  You can't do that.  OpenVSP will either assume you meant to set one or the other but won't let you do both.  If your intent is to have antisymmetric control of each V-tail rudder/elevon, then you'll have to make two wing components, one on the right and one on the left. Then each will have a single control surface that you can deflect positive or negative as you wish.

[Rob McDonald]

Brandon,

You are supposed to be able to assign surfaces to multiple groups -- it is a bug that you can't.

The use case is pretty much what this user is doing.  To simulate mixing of control surfaces.

Say you have a flying wing with one movable surface on each wing.  You want to treat them as elvons.  So, you define an elevator with symmetric deflection and an aileron with antisymmetric deflection.

OpenVSP and VSPAERO should handle this.  It is broken right now...

Rob

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